[Disclaimer: Optimized but still can be heavy on performance for some on serverside]
This project originally got made for CreateMod as an addon to make the gameplay a bit more challenging and interesting, while not adding in new blocks and items. The mod itself only changes how Stress is calculated in the CreateMod. If the Create machines are working aka. crafting/processing it will apply that extra multiplier thus making the machines use more stress.

Also available on Modrinth: https://modrinth.com/mod/create-reactive-stress-crs

Recommeded to use with but optional (for realism goers):
Create: Picky Wheels (makes water wheels/windmills spam limited to biomes)

Create: Low Heated (removes the ability to use campfires for steam engines)

Currently avaliable in the mod:

Support for both 1.20.1/1.21.1 Create v6

The multipliers can be changed in the mod's config.

Supports:

Mechanical Press x2.5
Mechanical Mixer x2
Mechanical Saw (partial:horizontal mode) x2
Mill Stone x2
Crushing wheel x3
API for other mods to implement, supports multiple entrys (BETA | havent been tested but should work)
Create's Goggles now can show extra information "Max Stress Usage-At current RPM"

Does not work with:

(Note: most of them already passive machines eg.: Fan)

Mechanical Crafters
Mechanical Drill
Mechanical Arm
Deployer
Mechanical Fan

Source: https://github.com/Peterhunary/Reactive-Stress/branches
NOTE:
Should work on server-side only but optional on client.

Q: Can i use it in my modpack? A: Yes, feel free to use it.

Dont forget to mention/link a reference for the credits.

Create: Reactive Stress (CRS)